US-20260126330-A1 - PRESSURE SENSOR

US20260126330A1US 20260126330 A1US20260126330 A1US 20260126330A1US-20260126330-A1

Abstract

A pressure sensor includes a sensing element and an integrated circuit unit. The sensing element includes a pressure port, a glass and a strain gauge. One end of the pressure port is provided with a pressure inlet channel, a periphery of the pressure port is provided with a sensing plane, the strain gauge is attached on the sensing plane, the strain gauge is configured to sense pressure applied on a sensing membrane, and the glass is configured to bond the strain gauge and the sensing plane. The sensing element is an integrally manufactured structure, a wall thickness of the sensing membrane between the sensing plane and an inner surface of the pressure inlet channel is defined as W, and W is not less than 0.1 mm and not greater than 0.6 mm.

Inventors

Wenqiang XU

Assignees

CHUROD SENSING TECHNOLOGIES (SUZHOU) CO., LTD

Dates

Publication Date: 20260507
Application Date: 20251230
Priority Date: 20230706

Claims (8)

1 . A pressure sensor, comprising: a sensing element, wherein the sensing element comprises a pressure port, a glass and a strain gauge, one end of the pressure port is provided with a pressure inlet channel, a periphery of the pressure port is provided with a sensing plane, the strain gauge is attached on the sensing plane, the strain gauge is configured to sense pressure applied on a sensing membrane, and the glass is configured to bond the strain gauge and the sensing plane; and an integrated circuit unit, wherein the integrated circuit unit is provided at one end of the sensing element away from the pressure inlet channel and is electrically connected to the strain gauge, wherein the sensing element is an integrally manufactured structure, a wall thickness of the sensing membrane between the sensing plane and an inner surface of the pressure inlet channel is defined as W, and W is not less than 0.1 mm and not greater than 0.6 mm.
2 . The pressure sensor according to claim 1 , wherein a cross-sectional shape of the pressure inlet channel at the sensing membrane is circular or elliptical.
3 . The pressure sensor according to claim 1 , wherein: the pressure sensor is further provided with an installation housing, and a storage space is provided in the installation housing; the integrated circuit unit is provided in the storage space and is arranged along an extension direction of the storage space; the sensing element is connected to the installation housing and is at least partially provided in the storage space; and one end of the sensing element provided with the pressure inlet channel is exposed on one side of the installation housing.
4 . The pressure sensor according to claim 3 , wherein the installation housing comprises: a housing body, wherein the storage space is formed in the housing body, one end of the housing body is provided with an installation hole, the sensing element is plugged into the installation hole, and a portion of the sensing element provided with the sensing plane is provided in the storage space through the installation hole; a support frame, wherein the support frame is provided in the storage space, and the integrated circuit unit is installed at the support frame; and a connection terminal, wherein the connection terminal is electrically connected to the integrated circuit unit and is partially exposed at one end of the housing body away from the installation hole.
5 . The pressure sensor according to claim 3 , wherein the installation housing comprises: a housing having an inner cavity; a spring holder provided at one end of the housing, wherein a first through hole is provided at the spring holder; a spring provided in the first through hole, wherein one end of the spring extends out of a top surface of the spring holder; a conductive terminal located in the inner cavity of the housing, wherein one end of the conductive terminal is abutted against another end of the spring; and a circuit board located in the inner cavity of the housing, wherein one end of the circuit board is connected to another end of the conductive terminal, wherein a bottom of the spring holder is provided with a groove, a top of the circuit board is provided in the groove, a gap is provided between the top of the circuit board and a wall of the groove, a second through hole is provided on the circuit board, and another end of the conductive terminal is fixedly connected to the circuit board through the second through hole; and a spring contact platform is provided on the conductive terminal, a bottom end of the spring is abutted against the spring contact platform, and the conductive terminal is inserted into an inner circle of the spring at one end close to the spring.
6 . The pressure sensor according to claim 5 , wherein a top of the spring holder is provided with a first plane and a second plane, the second plane is located on one side of the first plane, an arc-shaped transition is formed between the first plane and the second plane, a notch is formed between the first plane and the second plane, and the first through hole is located on the second plane.
7 . The pressure sensor according to claim 5 , wherein an aperture of the first through hole varies along an axial length of the first through hole, and the aperture of the first through hole is larger than an outer diameter of the spring.
8 . The pressure sensor according to claim 5 , wherein a number of the first through hole, the spring, the second through hole, and the conductive terminal is multiple.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Application No. PCT/CN2024/104042, filed on July 5, 2024, which claims priority to Chinese Patent Application No. 202310821406.5, filed on July 6, 2023, and Chinese Patent Application No. 202420773047.0, filed on April 15, 2024. The disclosures of the above-mentioned applications are incorporated herein by reference in their entireties. TECHNICAL FIELD The present application relates to the technical field of measuring fluid pressure, and in particular to a pressure sensor. BACKGROUND At present, in order to reduce the space occupied by pressure sensors in hydraulic brake systems, most of the existing pressure sensors adopt lateral sensing elements to sense the pressure of the fluid in the hydraulic brake system. The brake fluid flows into the fluid channel inside the sensing element, and a strain gauge is set on the sensing surface on the outer peripheral side of the sensing element. The strain gauge can sense the pressure applied on the sensing membrane and transfer the pressure to a voltage signal, thereby monitoring the brake pressure in real time. However, in the existing pressure sensors, the sensing elements are mostly split design. A processing hole is manufactured on a side of the sensing element away from the sensing surface to make the wall thickness of the sensing membrane uniform, and then the sealing ball is welded to seal the processing hole to achieve the sealing of the fluid channel. However, the production cost of the split sensing element is high, and the manufacturing process is more complicated due to the introduction of welding and leak test, and there is also a risk of welding leakage. The sensing element is easily affected by the welding residual stress, resulting in the output drift of the sensing element, affecting the sensing accuracy of the pressure sensor. During the operation of the pressure sensor, thermal stress is also easily generated due to the different materials and thermal expansion coefficients of the seal ball and the sensing element, further reducing the detection accuracy and reliability of the pressure sensor. The main purpose of the present application is to provide a pressure sensor, aiming to improve the structure of the sensing element of the pressure sensor and improve the detection accuracy and reliability of the pressure sensor. In order to achieve the above purpose, the present application provides a pressure sensor, including: a sensing element and an integrated circuit unit. The sensing element includes a pressure port, a glass and a strain gauge. One end of the pressure port is provided with a pressure inlet channel, a periphery of the pressure port is provided with a sensing plane, the strain gauge is attached on the sensing plane, and the glass is configured to bond the strain gauge and the sensing plane. The integrated circuit unit is provided at one end of the sensing element away from the pressure inlet channel and is electrically connected to the strain gauge. The sensing element is an integrally manufactured structure, a wall thickness of the sensing membrane between the sensing plane and an inner surface of the pressure inlet channel is defined as W, and W is not less than 0.1 mm and not greater than 0.6 mm. In an embodiment, a cross-sectional shape of the pressure inlet channel at the sensing membrane is circular or elliptical. In an embodiment, the pressure sensor is further provided with an installation housing, and a storage space is provided in the installation housing; the integrated circuit unit is provided in the storage space and is arranged along an extension direction of the storage space; the sensing element is connected to the installation housing and is at least partially provided in the storage space; and one end of the sensing element provided with the pressure inlet channel is exposed on one side of the installation housing. In an embodiment, the storage space is formed in the housing body, one end of the housing body is provided with an installation hole, the sensing element is plugged into the installation hole, and a portion of the sensing element provided with the sensing plane is provided in the storage space through the installation hole. The support frame is provided in the storage space, and the integrated circuit unit is installed at the support frame. The connection terminal is electrically connected to the integrated circuit unit and is partially exposed at one end of the housing body away from the installation hole. In an embodiment, the installation housing includes: a housing having an inner cavity; a spring holder provided at one end of the housing, a first through hole is provided at the spring holder; a spring provided in the first through hole, one end of the spring extends out of a top surface of the spring holder; a conductive terminal located in the inner cavity of the housing, one end of the conductive ter